Figure 4.

Features of a network generated by the growth model. A, Fragment of the growth environment with longitudinal axons and some commissural axons crossing the floor plate (thin lines with ends at *), dendrites at the longitudinal position of the neuron soma (thick vertical bars), and circular synapses. The location of the fragment is shown by the black rectangle in the inset of the growth environment. B, Map of cIN dendrites (blue) in part of one side showing dIN synapses (dots). C, Longitudinal distribution of synapse numbers (per 100 μm of CNS) for major connections from sensory RB neurons, via interneurons to motoneurons (Fig. 1C).